Milorganite is a brand name for a fertilizer made from treated sewage sludge. While it is a well-known product, there are several synonyms that can be used in place of Milorganite. These include biosolids, which is the name given to municipal wastewater treatment residual solids, and treated sewage sludge, which is the byproduct of sewage treatment plants. Other terms that can be used as synonyms for Milorganite include organic fertilizer, humus, compost, and manure. These terms all refer to materials that can be added to soil to improve its fertility and provide nutrients to plants. When choosing a fertilizer, it is important to consider the specific needs of the plants you are growing, as well as the environmental impact of the product.